Interesting coupling logic of feeding network resonator

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SUMMARY

The discussion focuses on a resonator system comprising 64 gap-coupled small resonators, exhibiting four distinct resonances at 5.7 GHz, 6.25 GHz, 6.78 GHz, and 7.172 GHz. The strongest coupling occurs at 5.7 GHz, with coupling diminishing at higher frequencies. The primary inquiry is whether there are methods to enhance coupling specifically at the 6.78 GHz resonance frequency.

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yefj
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Hello,I have built a resonator which consists from 64 gap coupled small resonators. I have 4 resonances 5.7Ghz (the strongest coupling) 6.25Ghz 6.78Ghz 7.172Ghz as shown below . the coupling of the resonances getting smaller as the frequency rises. Is there a way to increase the coupling on the 6.78Ghz resonance?
Thanks.
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